/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.plan.planner.plan.node.metedata.read;

import com.google.common.collect.ImmutableList;
import org.apache.iotdb.common.rpc.thrift.TRegionReplicaSet;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.commons.path.PathDeserializeUtil;
import org.apache.iotdb.commons.path.PathPatternTree;
import org.apache.iotdb.db.metadata.template.Template;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.*;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.source.SourceNode;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * This class defines the scan task of schema fetcher.
 */
public class SchemaFetchScanNode extends SourceNode {

    private final PartialPath storageGroup;
    private final PathPatternTree patternTree;
    private final Map<Integer, Template> templateMap;
    private final boolean withTags;
    private TRegionReplicaSet schemaRegionReplicaSet;

    public SchemaFetchScanNode(
            PlanNodeId id,
            PartialPath storageGroup,
            PathPatternTree patternTree,
            Map<Integer, Template> templateMap,
            boolean withTags) {
        super(id);
        this.storageGroup = storageGroup;
        this.patternTree = patternTree;
        this.patternTree.constructTree();
        this.templateMap = templateMap;
        this.withTags = withTags;
    }

    public PartialPath getStorageGroup() {
        return storageGroup;
    }

    public PathPatternTree getPatternTree() {
        return patternTree;
    }

    public Map<Integer, Template> getTemplateMap() {
        return templateMap;
    }

    @Override
    public List<PlanNode> getChildren() {
        return Collections.emptyList();
    }

    @Override
    public void addChild(PlanNode child) {
    }

    @Override
    public PlanNode clone() {
        return new SchemaFetchScanNode(
                getPlanNodeId(), storageGroup, patternTree, templateMap, withTags);
    }

    @Override
    public int allowedChildCount() {
        return 0;
    }

    @Override
    public List<String> getOutputColumnNames() {
        return ImmutableList.of();
    }

    @Override
    public String toString() {
        return String.format(
                "SchemaFetchScanNode-%s:[StorageGroup: %s, DataRegion: %s]",
                this.getPlanNodeId(),
                storageGroup,
                PlanNodeUtil.printRegionReplicaSet(getRegionReplicaSet()));
    }

    @Override
    protected void serializeAttributes(ByteBuffer byteBuffer) {
        PlanNodeType.SCHEMA_FETCH_SCAN.serialize(byteBuffer);
        storageGroup.serialize(byteBuffer);
        patternTree.serialize(byteBuffer);

        ReadWriteIOUtils.write(templateMap.size(), byteBuffer);
        for (Template template : templateMap.values()) {
            template.serialize(byteBuffer);
        }
        ReadWriteIOUtils.write(withTags, byteBuffer);
    }

    @Override
    protected void serializeAttributes(DataOutputStream stream) throws IOException {
        PlanNodeType.SCHEMA_FETCH_SCAN.serialize(stream);
        storageGroup.serialize(stream);
        patternTree.serialize(stream);
        ReadWriteIOUtils.write(templateMap.size(), stream);
        for (Template template : templateMap.values()) {
            template.serialize(stream);
        }
        ReadWriteIOUtils.write(withTags, stream);
    }

    public static SchemaFetchScanNode deserialize(ByteBuffer byteBuffer) {
        PartialPath storageGroup = (PartialPath) PathDeserializeUtil.deserialize(byteBuffer);
        PathPatternTree patternTree = PathPatternTree.deserialize(byteBuffer);

        int templateNum = ReadWriteIOUtils.readInt(byteBuffer);
        Map<Integer, Template> templateMap = new HashMap<>();
        Template template;
        for (int i = 0; i < templateNum; i++) {
            template = new Template();
            template.deserialize(byteBuffer);
            templateMap.put(template.getId(), template);
        }
        boolean withTags = ReadWriteIOUtils.readBool(byteBuffer);
        PlanNodeId planNodeId = PlanNodeId.deserialize(byteBuffer);
        return new SchemaFetchScanNode(planNodeId, storageGroup, patternTree, templateMap, withTags);
    }

    @Override
    public void open() throws Exception {
    }

    @Override
    public TRegionReplicaSet getRegionReplicaSet() {
        return schemaRegionReplicaSet;
    }

    @Override
    public void setRegionReplicaSet(TRegionReplicaSet schemaRegionReplicaSet) {
        this.schemaRegionReplicaSet = schemaRegionReplicaSet;
    }

    @Override
    public void close() throws Exception {
    }

    @Override
    public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
        return visitor.visitSchemaFetchScan(this, context);
    }

    public boolean isWithTags() {
        return withTags;
    }
}
